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Design of ultralong-life Li–CO2 batteries with IrO2 nanoparticles highly dispersed on nitrogen-doped carbon nanotubes

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Abstract

Li–CO2 batteries have gained tremendous popularity since they can not only realize the eco-friendly utilization of the greenhouse gas CO2, but also offer high theoretical energy density. However, they still suffer from several problems, such as high overpotential and poor cycling life. High-efficiency electrocatalysts for carbon dioxide reduction and Li2CO3 decomposition play a critical role in Li–CO2 batteries. In this work, nitrogen-doped carbon nanotubes modified with ultrafine IrO2 nanoparticles (IrO2-N/CNT) were introduced into the cathode of Li–CO2 batteries. The batteries with the IrO2-N/CNT cathode exhibited high specific capacity (4634 mA h g−1), low charge platform and overpotential (3.95 V/1.34 V), and ultralong cycling life (more than 2500 h/316 cycles at 100 mA g−1 with a fixed capacity of 400 mA h g−1). It is speculated that the high performance of the IrO2-N/CNT cathode is closely related to the superior catalytic activity of highly dispersed ultrafine IrO2 nanoparticles and the nitrogen-doped carbon nanotube network, which not only enhances the electronic conductivity and the capture ability of CNT for Li atoms/CO2, but also promotes reactions between Li+/CO2 and C/Li2CO3. This work paves a promising way to deploy an efficient cathode catalyst for ultralong-life Li–CO2 batteries.

Graphical abstract: Design of ultralong-life Li–CO2 batteries with IrO2 nanoparticles highly dispersed on nitrogen-doped carbon nanotubes

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Article information


Submitted
07 Oct 2019
Accepted
09 Jan 2020
First published
11 Jan 2020

J. Mater. Chem. A, 2020, Advance Article
Article type
Paper

Design of ultralong-life Li–CO2 batteries with IrO2 nanoparticles highly dispersed on nitrogen-doped carbon nanotubes

G. Wu, X. Li, Z. Zhang, P. Dong, M. Xu, H. Peng, X. Zeng, Y. Zhang and S. Liao, J. Mater. Chem. A, 2020, Advance Article , DOI: 10.1039/C9TA11028C

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